<script src="jquery-1.10.2.js" type="text/javascript"></script>


<input type="text" name="uname" value="I am default value" id="unameId" />


<script type="text/javascript">
  $(document).ready(function(){

    setTimeout(function(){
      $('#unameId').val("Rasmus Lerdorf")
    },1000);

  });
</script>

